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ERIC Number: EJ792399
Record Type: Journal
Publication Date: 2008-May
Pages: 6
Abstractor: Author
Reference Count: 2
ISSN: ISSN-1072-0839
Exploring Segment Lengths on the Geoboard
Ellis, Mark W.; Pagni, David
Mathematics Teaching in the Middle School, v13 n9 p520-525 May 2008
Given a 5-peg by 5-peg geoboard, how many different lengths can be made by stretching a rubber band to form an oblique segment between any two pegs? This investigation requires students to make connections to the Pythagorean theorem, congruence, and combinations. With its use of visual representation and a range of mathematical ideas that can be explored from simple to complex, this task makes meaningful mathematical investigations accessible to learners with varied levels of prior knowledge. (Contains 4 tables, 3 figures, and a classroom activity sheet.)
National Council of Teachers of Mathematics. 1906 Association Drive, Reston, VA 20191-1502. Tel: 800-235-7566; Tel: 703-620-3702; Fax: 703-476-2970; e-mail:; Web site:
Publication Type: Guides - Classroom - Teacher; Journal Articles; Reports - Descriptive
Education Level: Middle Schools
Audience: Teachers
Language: English
Sponsor: N/A
Authoring Institution: N/A